Improvement in lathes



k- 1243111 utm' l I N,PETERS. PHOTO-LITMBGRAPHER, WASHINGTON. D c.

2 shets-sneet 2. P. H. PITTS.

Turning Lathe.

"11361111861 Aug. v16, .1870.

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5l/attent @Wire PHILLIP H. PITTS, OF

WAvEnLY, MISSOURI.

Letters Patent No. 106,404, dated August 16,1870.

IMPROVEMENT IN LATHES.

The Schedule referred to in these Letters Patent and making part o( the same To all whom it may concern..-

Be it known that I, PHILLIP-H. PiT'rs, of Waverly, inthe county of Lafayette and State of Missouri,` have invented a new and useful- Improvement in Turning and Screw-cutting Lathes; and I do hereby declare that the following isa full, clear, and exact description thercof,iwhich will enable others skilled in the art to make and use the same, reference being had to the accompanyingdrawing forming part of this specification.

This invention relatesy to improvements in turning and screw-cutting lathes, and consists in a lathe.V so arranged that by shifting someot the parts it may b'e readily adjusted either for turning or cutting screwthreads on bolts.

Figure 1 is a plan view of' a lathe constructed according to my improvements.

Figure 2 is a transverse sectionon thelinc a: x.

Figure 3 is a transverse-section on the line y y.

' Figure 4 is a longitudinal section on the line z 5.'

Similar letters ot' reference indicate corresponding parts.

A is the ',live spindle; it is made hollow, and mounted in fixed bearings, and provided with driving gear, whereby it may be turned in either direction.

The said gear consists ot' the bevel-wheel B, pinion C, shaft I), and-driving-pulley'E.

The pinions are placed on opposite sides of the wheel B, and are arranged in the .ordinary way for shifting the connection from one to the other.

The center 11 ofthe live spindle is mounted in a plate, G, arranged in a groove across the face of the tace-plate H vto slide back and forth thereon, and has a screw-cutting die, I, in it, which may be brought to coincide with the axis. This plate is secured in.

any required position by a set-screw, K, or it may be by any other means.

The tail-center L is `supported between a vertically adjustable block, M, "inounted ou a slide, N, and a clamping-bar, O, screwed down upon it by the handscrew P, and working on the rods Q rising from the said slide. j v

The screw works through a yoke, It, attached to the slide N by the rods Q. The latter are'providcd with springs Q', to raise the bar O when the screw is raised.

The block M is adjusted by aA screw, S, screwing up through the slide N.

This slide works on the ways T to and from' the" face-plate H, and is moved up toward it by a vfeedscrew, U, screwing through the cross-bar lV.

The tool-support Vis'a-rranged on the Ways T, and the feed-screws T', so that it can be swung over on the feed-screw oi from the ways T.

A weight is used to hold it firmly on the ways to prevent chattering. The weight is taken olio when the lslide is raised.

For turning the bolts or other articles, the centers F L are placed in ,the position represented in iig. 1,

and the turning is done in the ordinary7 way; but for threading bolts the plate G is movedalong the groove in the face-plate- H,.to adjust it so that the die will coincide with the axis of the mandrel A.

The tail-center L is removed and the tool-rest is swung off the ways T'.

'lhe bolt to be threaded is then clamped in the place ol" the said center and moved up and forced into the die by the screw U. It is discharged from the die after cutting by reversing the mot-ion of the mandrei Iand screwing it ont again.

v For cutting the threads ou bolts ot' different sizes, other plates, G, are provided with dies of different sizes.

The adjusting block M admits ot' holding-rods of any size, so as to coincide with the axis of the die.

This machine may also `be used for drilling, the drill being tapped in the place of. the screw-taps, and the thing `to bel drilled lield against the face-plate.

Having thus described my invent-ion.,

I claim as new and desire to secure by Letters Patent- 1. The device for supporting and adjust-ing the tailcenter, consisting of the slide N, yoke R, bai- 0, rods Q, block M, springs Q', and screws P and S, as del scribed. 1-

2. The combination, with the mandrel, face-plate, and'centers of a lathe, of the devicefor sulgiport-ingr and adjusting the tail-center, the tool-rest V, and feed-screw T, arranged relatively thereto, as described..

3. The arrangement of the live center and screwl .Wituesses:

SAMUEL OoLLINs, RICHARD D. GANTHoRN. 

